Has anyone had or considered amniocentesis

Katie

We’re having twins and found out one of our babies is measuring small. More concerning is that his legs and arms are measuring shorter than what they should be for his size which can be a sign of Down syndrome or just a normal variation. We did the first trimester screen for chromosomal abnormalities and got good results back but now I’m just so worried about my little guy. I’m not sure what to do.